Just as love is an orientation which refers to all objects and is incompatible with the restriction to one object, so is reason a human faculty which must embrace the whole of the world with which man is confronted.

This quote is saying that love, like reason, is something that is universal and inclusive. Love isn’t restricted to just one special person or thing – it’s open to all kinds of people and things. Similarly, reason is something that’s meant to help people understand everything that exists in the world. It’s not supposed to be limited or narrow; instead, it’s meant to provide an understanding of the world as a whole.